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GeForce GTS 450 1GB vs Radeon HD 4770

Intro

The GeForce GTS 450 1GB features clock speeds of 783 MHz on the GPU, and 902 MHz on the 1024 MB of GDDR5 RAM. It features 192 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 4770, which comes with core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 RAM. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770

80 Watts

GeForce GTS 450 1GB

106 Watts

Difference: 26 Watts (33%)

Memory Bandwidth

As far as performance goes, the GeForce GTS 450 1GB should theoretically be a bit better than the Radeon HD 4770 overall. (explain)

GeForce GTS 450 1GB

57728 MB/sec

Radeon HD 4770

51200 MB/sec

Difference: 6528 (13%)

Texel Rate

The GeForce GTS 450 1GB should be a little bit (more or less 4%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce GTS 450 1GB

25056 Mtexels/sec

Radeon HD 4770

24000 Mtexels/sec

Difference: 1056 (4%)

Pixel Rate

The GeForce GTS 450 1GB will be a bit (more or less 4%) better at full screen anti-aliasing than the Radeon HD 4770, and capable of handling higher screen resolutions more effectively. (explain)

GeForce GTS 450 1GB

12528 Mpixels/sec

Radeon HD 4770

12000 Mpixels/sec

Difference: 528 (4%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

GeForce GTS 450 1GB

Amazon.com

Radeon HD 4770

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model

GeForce GTS 450 1GB

Radeon HD 4770

Manufacturer

nVidia

AMD

Year

September 2010

Apr 28, 2009

Code Name

GF106

RV740

Fab Process

40 nm

40 nm

Bus

PCIe x16

PCIe 2.0 x16

Memory

1024 MB

512 MB

Core Speed

783 MHz

750 MHz

Shader Speed

1566 MHz

(N/A) MHz

Memory Speed

902 MHz (3608 MHz effective)

800 MHz (3200 MHz effective)

Unified Shaders

192

640(128x5)

Texture Mapping Units

32

32

Render Output Units

16

16

Bus Type

GDDR5

GDDR5

Bus Width

128-bit

128-bit

DirectX Version

DirectX 11

DirectX 10.1

OpenGL Version

OpenGL 4.1

OpenGL 3.0

Power (Max TDP)

106 watts

80 watts

Shader Model

5.0

4.1

Bandwidth

57728 MB/sec

51200 MB/sec

Texel Rate

25056 Mtexels/sec

24000 Mtexels/sec

Pixel Rate

12528 Mpixels/sec

12000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x.
The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen.
The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.